Mr. Smith is building a detention room for students who like to throw spaghetti pieces in class. So he finds 3 areas and he is w
1 answer:
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Answer:
True
Step-by-step explanation:
given - ≥ 10 (multiply both sides by 18 )
- t ≥ 180 ( multiply both sides by - 1)
Remembering to reverse the symbol as a consequence of multiplying by a negative quantity, hence
t ≤ - 180
Answer:
B. z Subscript alpha divided by 2 zα/2 = 1.96.
Step-by-step explanation:
We are given that we want to construct a confidence interval. For this, the summary statistics for randomly selected weights of newborn girls:
n = 236, = 30.3 hg, s = 7.2 hg. The confidence level is 95%.
As we can clearly see here that the population standard deviation is unknown and the sample size is also very large.
It has been stated that when the population standard deviation is unknown, we should use t-distribution but since the sample size is very large so we can use z distribution also as it is stated that at very large samples; the t-distribution corresponds to the z-distribution.
Here, = level of significance = 1 - 0.95 = 0.05 or 5%
= 0.025 or 2.5%
So, the value of in the z table is given as 1.96 with a 2.5% level of significance.